<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .father{
            height: 500px;
            background: pink;
        }
        .son {
            width: 300px;
            height: 200px;
            background: red;
            margin: auto;
        }
    </style>
</head>
<body>
<div class="father">
    <div class="son"></div>
</div>
<script></script>
</body>
</html>
